[GreenKeys] Dovetron MPC-1000CR/T "Regenerative Tempest" MIL-SPEC RTTY TU

[COURYHOUSE at aol.com]

isolation for the loop current.  is always preferred......
 
Ed#--
 
 
In a message dated 11/30/2012 7:29:18 P.M. US Mountain Standard Time,  
k1lky at earthlink.net writes:


On  Nov 29, 2012, at 5:10 PM, Rainer Haack wrote:
> ...
> What does  the text  "Speed conversion is progammed OFF" on  
>  declaration sign of the military unit means and how can the speed   
> conversion switched to ON?

Rainer,

Not sure.   Quite possibly there is a jumper or one of the "DIP  
switches" to  set.  A DIP switch looks like an 8- or 16-pin integrated  
flat  pack circuit but has movable bits in the middle.  See below.

>  How - if its possible - can I make a loop support for the TTY?

The "/T"  in the units designator means "tempest".  This is a  
complicated  system of reducing electromagnetic (and acoustic)  
radiation from  communication equipment so "the enemy" cannot easily  
detect what is  being handled.  In the case of teletype equipment, it  
means  that the signals going between machines and electronic system  
parts  is low level (Low voltage, low current).  Your unit has no high   
level loop supply.

Follow the link offered by CORYHOUSE for an easy  to build simple  
gadget that will do the job:
"Nagle has an rs 232  converter on his   site

http://www.aetherltd.com/connecting.html

I would say if he  has it up there is  is a good one and well tested by   
him."

> There is no loop socket but a FSK socket on its  back.

The FSK socket (BNC, I am sure) has audio tones coming from it to  feed  
the audio input to a transmitter (usually an SSB  transmitter).  There  
are also two other connectors that send  out digital signals according  
the the RS-232 standard ("EIA -12M  +12S" as I see on a picture here),  
or the corresponding military  standard ("MIL +5M  -5S")  These three  
BNC connectors are  enclosed by a stripe marked "OUTPUT"

You need the document  MPC-1000T.pdf to help you figure all this out,  
and find what it  takes to turn the speed shifting on.  (I can send if  
you don't  find it online.)   Try:
www.hypertools.com/dovetron/Dovetron_MPC-1000T.pdf
www.alldatasheet.com/view.jsp?Searchword=MPC-1000T
ebookbrowse.com/1000t-pdf-d70475362
ebookbrowse.com/dovetron-mpc-1000t-pdf-d59085679


That  manual says:
"The speed conversion (SPEED CONVERT) switch S5 will normally  also be  
left in the ON (forward) position, but may be set to the OFF  position,  
depending on the operator's requirements "

I have a  diagram of an adapter by WA2HWJ, though it does not have  
isolation  for the loop current.

Roy

Roy  Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em  Glowing!



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